Deformed crank thread
 

Hi everybody. I want to remove crank arms, but thread on the right side is deformed. http://bikeforums.net/attachment.php...hmentid=326803
It looks something like in the picture. Only the two first threads are like that. Afterwards it is perfectly round. Will that ruin crank pullers threads? How can i fix this?

Thank you!

Park instructions for using a Bike Research tool to restore the threads.
http://bikeforums.net/attachment.php...hmentid=326806
You might have to use a round file to open the hole up a bit. If a bike shop near you has the tool that's the best option if you don't work on a lot of bikes.

or you can file those first two threads back to round and then put your puller in. Use a lubricant so it doesnt get stuck. BE VERY CAREFUL you dont cross-thread the puller.

-SP

It is highly unlikely that you'll damage the threads on your puller - if it is a decent tool - as the tool is (should be) hardened steel, and the crank is aluminum. At worst you would have to use a file card (tool for cleaning files) to get the aluminum out of the threads.

Thank you all for advice! It was really helpful. After quite a bit of time I managed to get the crank off. It was way more damaged than I thought.